Perhaps you should try some spelling variations:
"dung tieu data slippers" » "dung hieu data slippers", "dung tren data slippers", "dung tin data slippers", "dung lieu data slippers", "dung bieu dat slippers", "dung tien dat slippers", "dung tieu data slippery", "dung tieu data grippers"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung tieu data slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung tieu data slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tieu data slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tieu data slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.